From 8f3f3991023702d597728be7e37b1e46b3ad7e46 Mon Sep 17 00:00:00 2001 From: pirofti <> Date: Mon, 6 Jul 2020 13:33:06 +0000 Subject: Add support for timeconting in userland. This diff exposes parts of clock_gettime(2) and gettimeofday(2) to userland via libc eliberating processes from the need for a context switch everytime they want to count the passage of time. If a timecounter clock can be exposed to userland than it needs to set its tc_user member to a non-zero value. Tested with one or multiple counters per architecture. The timing data is shared through a pointer found in the new ELF auxiliary vector AUX_openbsd_timekeep containing timehands information that is frequently updated by the kernel. Timing differences between the last kernel update and the current time are adjusted in userland by the tc_get_timecount() function inside the MD usertc.c file. This permits a much more responsive environment, quite visible in browsers, office programs and gaming (apparently one is are able to fly in Minecraft now). Tested by robert@, sthen@, naddy@, kmos@, phessler@, and many others! OK from at least kettenis@, cheloha@, naddy@, sthen@ --- src/lib/libc/crypt/bcrypt.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'src/lib/libc/crypt/bcrypt.c') diff --git a/src/lib/libc/crypt/bcrypt.c b/src/lib/libc/crypt/bcrypt.c index 82de8fa33b..ba45b104ed 100644 --- a/src/lib/libc/crypt/bcrypt.c +++ b/src/lib/libc/crypt/bcrypt.c @@ -1,4 +1,4 @@ -/* $OpenBSD: bcrypt.c,v 1.57 2016/08/26 08:25:02 guenther Exp $ */ +/* $OpenBSD: bcrypt.c,v 1.58 2020/07/06 13:33:05 pirofti Exp $ */ /* * Copyright (c) 2014 Ted Unangst @@ -248,9 +248,9 @@ _bcrypt_autorounds(void) char buf[_PASSWORD_LEN]; int duration; - clock_gettime(CLOCK_THREAD_CPUTIME_ID, &before); + WRAP(clock_gettime)(CLOCK_THREAD_CPUTIME_ID, &before); bcrypt_newhash("testpassword", r, buf, sizeof(buf)); - clock_gettime(CLOCK_THREAD_CPUTIME_ID, &after); + WRAP(clock_gettime)(CLOCK_THREAD_CPUTIME_ID, &after); duration = after.tv_sec - before.tv_sec; duration *= 1000000; -- cgit v1.2.3-55-g6feb